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Thread: Which eye pieces should I buy?

  1. #1
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    Unhappy Which eye pieces should I buy?



    Hi.

    I just purchased my first telescope (Celestron NexStar 4se)... I broke it out last night and had an awesome time but things appeared much smaller in than I expected. Are there certain eye pieces that might enlarge things a bit? I was looking for a little advice on what eye pieces I may need to purchase.

    As for what I'm viewing -- pretty much everything! I want to see Galaxies, star clusters, nebulas and definitely planets... Is there possibly a one-for-all eye-piece that might do the trick or do I need to use something different per each category of objects I'm viewing?

    Any direction greatly appreciated!

    T

  2. #2
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    Default Re: Which eye pieces should I buy?

    Welcome to the forum.

    When you say, "... but things appeared much smaller in than I expected." I don't know what you expect as that's a personal thing.

    That scope can be a solar system (planets & the moon) killer with a focal ratio of f/13. It's not the greatest deep space object (DSO) scope because its Field Of View (FOV) is pretty narrow due to the long focal length (1325mm) and rather small aperture (102mm). However, there are plenty of DSOs that can be had, so don't be discouraged by my candor.

    Here's a short article with some calculators that can get you started researching eyepieces...
    Your Complete Telescope Eyepiece Guide from Sky & Telescope

    You're off to a good start. I'll say this... as you progress in this hobby, you'll end up with an eyepiece case that has maybe 7-8 eyepieces that will fill your needs with just about any scope and will likely cost more than any of your scopes. Try to avoid cheaper eyepieces if possible... you'll get what you pay for. I'll avoid brand names simply because if I forget one, someone may get their feelings pinched.

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    Default Re: Which eye pieces should I buy?

    Congrats on the new scope!

    I believe that your scope comes with a 25mm Plossl eyepiece that will give you 53x. You will get a slightly wider FOV with a 32mm eyepiece (41X). The 25mm or 32mm eyepiece will be used most often for DSOs.

    For lunar and planetary observing under average seeing consider something in the 12mm range, alternatively pick up a 2X shorty barlow to use with your existing eyepiece which will give you 53X, 80X (remove the lens assembly from the barlow and screw into the 25mm eyepiece barrel for 1.5x), and 106X.
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    Default Re: Which eye pieces should I buy?

    The nice thing with a scope of this focal length you do not need really expensive eyepieces to get great views.
    Check out the GSO or Sterlings Plossls or even the Bresser Plossls for a slightly wider field of view.
    In the meantime, enjoy your scope
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  5. #5
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    Default Re: Which eye pieces should I buy?

    Welcome to the forum, Tommy!

    You will not be able to see astronomical objects in the same size and details as they appear in Astronomy books and magazines.

    In amateur telescopes even the largest one they will always appear smallish. Many still look beautiful, but many more appear as little fuzzy specs.

    Still, we can help you to find right EPs to get the most out of your scope, and with time and experience you will see more details.

    Looks like your scope comes with only one 25mm EP, which gives 53x magnification.

    I would suggest to buy a good quality 32mm Plossl for wider views, since some of objects are quite large and are better observed at lower power. Also, if you get 2x barlow you will be able to achieve additional magnifications by using barlow with your EPs.

    You will get 106x (25mm+barlow), 82x (32mm+barlow), 53x (25mm) and 41x (32mm). That should be enough to observe all kinds of objects.

    GSO Plossl and barlows are of good quality and wouldn't break your wallet.

    GSO 1.25" Plossl Eyepiece - 32mm

    GSO 1.25" 2x "Shorty" Achromatic Barlow Lens # GS2BL

    Lens of 2x barlow can be unscrewed from barlow's body and screwed on EP given 1.5x increase, this will provide even more magnification options for you.

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    Default Re: Which eye pieces should I buy?

    Thank you all..!! Very awesome advice here and it's become VERY obvious that I have a LOT to learn (which I'm looking forward to).

    I went ahead and ordered the GSO Plossel, and GSO Shorty.... Can't wait to see what these babies can do!

    I really appreciate your time and trouble responding. I'll report back!

    Thanks.

    T
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    Default Re: Which eye pieces should I buy?

    Great! Higher powers 82-106x will be good on the moon, planets and double stars and lower powers on DSOs.

  8. #8
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    Default Re: Which eye pieces should I buy?

    Someone once wrote that you only need three eyepieces, a 50-70 power wide field, a 90 - 120 power, and a 120 - 150 power planetary. I find these are what I use most often.


    And here are three posts on this forum that go into eyepiece selection in depth. Anyone thinking about eyepieces would do well to read these:

    A Treatise on Optimizing Planetary Views

    A Treatise on Optimizing DSO Observation

    http://www.astronomyforum.net/telesc...eyepieces.html
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